Izakhiwo nezinqubo zenqubo zokubumba kweplastiki yokubumba kuthintwa yizici eziningi. Amapulasitiki ahlukene adinga ukwakha amapharamitha abikayo alungele izakhiwo zawo ukuze athole izakhiwo ezinhle kakhulu zemishini.
Amaphoyinti okubumba umjovo anjengokulandelayo:
Isilinganiso esisodwa, se-shrinkage
Izici ezithinta i-shrinkage eyakhelwayo yamapulasitiki we-thermoplastic anjengokulandelayo:
1..TYPES kwamapulasitiki
| Cha. | -Thambile esandleniibizo | ShrinkageRudle |
| 1 | I-PA66 | 1% -2% |
| 2 | I-PA6 | 1% -1.5% |
| 3 | I-PA612 | 0.5% -2% |
| 4 | Ipthiyor | 1.5% -2.8% |
| 5 | PC | 0.1% -0.2% |
| 6 | Isiphumelelo | 2% -3.5% |
| 7 | PP | I-1.8% -2.5% |
| 8 | PS | 0.4% -0.7% |
| 9 | Uhlobo lwenhlanzi | 0.2% -0.6% |
| 10 | -Valeke | 0.4% -0.5% |
2.Usayizi nokwakheka kwesikhunta sokubumba. Ubukhulu obukhulu odongeni noma uhlelo olubi lokupholisa lungathinta i-shrinkage. Ngaphezu kwalokho, ukuba khona noma ukungabikho kokufakwa kanye nokwakheka kanye nenani lokufakwa okuthinta ngqo ukuholwa kokugeleza, ukusatshalaliswa kobunzima kanye nokuphikiswa kwe-shrinkage.
3.Ifomu, usayizi nokusabalalisa komlomo wezinto ezibonakalayo. Lezi zinto zithinta ngokuqondile ukuqondiswa kokugeleza kwezinto ezibonakalayo, ukusatshalaliswa kwengcindezelo, ingcindezi ibamba nomphumela we-shrinkage nomphumela wesikhathi.
Ingcindezi yokushisa ye-4.mold nengcindezi.
Izinga lokushisa le-Main liphezulu, ukuncibilika kuncibilike kuphezulu, izinga lokucwilisa lepulasitiki liphezulu, ikakhulukazi ipulasitiki ene-crystaltaltity ephezulu. Ukusatshalaliswa kwamazinga okushisa nokufana kwezingxenye zepulasitiki nakho kuthinta ngqo i-shrinkage kanye nesiqondisi.
Ukugcinwa kwengcindezi nobude besikhathi futhi kunomthelela ekuqothulweni. Ingcindezi ephezulu, isikhathi eside izoncipha kepha ukuqondisa kukhulu. Ngakho-ke, lapho amazinga okushisa abumba, ingcindezi, isivinini sokubumba isijolo nesikhathi sokupholisa nezinye izinto nazo zingase ziguqule ukushintsha kwe-shrinkage yezingxenye zepulasitiki.
Idizayini yokubumba ngokuya ngobubanzi obuhlukahlukene bamapulasitiki, ubukhulu bodonga lweplastiki, ukwakheka, usayizi wefomu lokungenisa kanye nokusatshalaliswa, ngokuya ngesipiliyoni sokuthola i-shrinkage yengxenye ngayinye yepulasitiki, bese ukubala usayizi we-cavity.
Ezingxenyeni zepulasitiki ezinengqondo ephezulu futhi kunzima ukuqonda inani le-shrinkage, ngokuvamile kufanelekile ukusebenzisa izindlela ezilandelayo ukuklama isikhunta:
a) Thatha i-shrinkage encane yezingxenye zepulasitiki kububanzi obungaphandle kanye ne-shrinkage enkulu ukuze ube nendawo yokuguqulwa ngemuva kokuhlolwa kokubumba.
b) Ukuhlolwa kokubumba ukuthola ifomu lesistimu yokusakaza, usayizi kanye nokwakha izimo.
c) Ukushintshwa kosayizi kwezingxenye zepulasitiki ukuze ziphinde ziphindwe kunqunywe ngemuva kokuphindisela (ukulinganisa kumele kube amahora angama-24 ngemuva kokuhlubula).
d) shintsha isikhunta ngokuya nge-shrinkage yangempela.
e) Ukufa kungaphinde kukhishwe futhi inani le-shrinkage lingashintshwa kancane ngokushintsha izimo zenqubo ngendlela efanele ukuze zihlangabezane nezidingo zezingxenye zepulasitiki.
Okwesibili,Ukwehliswa
- U-fluity of thermoplastics uvame ukuhlawulwa ngochungechunge lwezinkomba ezinjengesisindo se-molecular, inkomba ye-archamedes, i-archamedes spine flow ubude, i-archamedes spine flow ubude, ukuhlakanipha kokusebenza kanye nokuqina kweplastiki). Kumapulasitiki egama elifanayo, ukucaciswa kufanele kuhlolwe ukuthola ukuthi uketshezi lwabo lufanelekile ukubumba komjovo.
Ngokusho kwezidingo zokwakheka kwesikhunta, uketshezi lwamapulasitiki asetshenziswa kaningi angahlukaniswa ngezigaba ezintathu:
a) uketshezi oluhle lwe-PA, PE, IHu, i-PP, CA nePolymethylthyine;
b) uchungechunge oluphakathi lwe-polystyrere resin (efana ne-abs, as), pmma, pom, polyphenyl ether;
c) I-PC ye-Fluity PC, i-PVC enzima, i-polyphenyl ether, i-polysulfone, i-polyaromatic sulfone, ipulasitiki ye-fluorine.
- U-fluidity of plastitics ahlukahlukene futhi ushintsha ngenxa yezici ezahlukahlukene zokwakha. Izici eziphambili ezinethonya zimi ngokulandelayo:
a) izinga lokushisa. Izinga lokushisa eliphakeme lizokhulisa ukungalingani, kepha amapulasitiki ahlukene ahlukile, ps (ikakhulukazi ukumelana nomthelela kanye nenani eliphakeme le-MFR), i-PP, PA, PMMA, AB, PC, PC, PCELIMITITITITY ngokushintsha kwamazinga okushisa. Ukuze uthole i-PE, pom, khona-ke ukukhuphuka kwezinga lokushisa futhi kuncipha kunomthelela omncane ekubumbeni kwabo.
b) ingcindezi. Ukuhlobisa ingcindezi yokuhlobisa kwenyuka kuncibilike ngesenzo se-shear, kukhuphuke futhi, ikakhulukazi i-PE, i-pom ibucayi kakhulu, ngakho-ke isikhathi sokuhlobisa ingcindezi yokubumba.
c) Isakhiwo sokufa. Ngokuthela ifomu lesistimu, usayizi, ukwakheka, uhlelo lokupholisa, uhlelo lokuphelelwa amandla nezinye izinto zithinta ngokuqondile ukuhamba kwangempela kwezinto ezincibilikisiwe emgodini.
Idizayini yokubumba kufanele isuselwe ekusetshenzisweni kwepulasitiki, khetha isakhiwo esifanelekile.Mungunga futhi ungalawula izinga lokushisa lezinto ezibonakalayo, izinga lokushisa lokushisa kanye nesivinini somjovo, isivinini somlingo kanye nezinye izinto ukuze ulungise kahle ukugcwaliswa ukuze kuhlangatshezwane nezidingo zokubumba.
Isikhathi sePosi: 29-10-21